<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Does real time logging of Transport level information.
 *
 * @package    Swift
 * @subpackage Plugins
 * @author     Chris Corbyn
 */
class Swift_Plugins_LoggerPlugin implements Swift_Events_CommandListener, Swift_Events_ResponseListener, Swift_Events_TransportChangeListener, Swift_Events_TransportExceptionListener, Swift_Plugins_Logger
{
	/** The logger which is delegated to */
	private $_logger;

	/**
	 * Create a new LoggerPlugin using $logger.
	 *
	 * @param Swift_Plugins_Logger $logger
	 */
	public function __construct(Swift_Plugins_Logger $logger)
	{
		$this->_logger = $logger;
	}

	/**
	 * Add a log entry.
	 *
	 * @param string $entry
	 */
	public function add($entry)
	{
		$this->_logger->add($entry);
	}

	/**
	 * Clear the log contents.
	 */
	public function clear()
	{
		$this->_logger->clear();
	}

	/**
	 * Get this log as a string.
	 *
	 * @return string
	 */
	public function dump()
	{
		return $this->_logger->dump();
	}

	/**
	 * Invoked immediately following a command being sent.
	 *
	 * @param Swift_Events_CommandEvent $evt
	 */
	public function commandSent(Swift_Events_CommandEvent $evt)
	{
		$command = $evt->getCommand();
		$this->_logger->add(sprintf(">> %s", $command));
	}

	/**
	 * Invoked immediately following a response coming back.
	 *
	 * @param Swift_Events_ResponseEvent $evt
	 */
	public function responseReceived(Swift_Events_ResponseEvent $evt)
	{
		$response = $evt->getResponse();
		$this->_logger->add(sprintf("<< %s", $response));
	}

	/**
	 * Invoked just before a Transport is started.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function beforeTransportStarted(Swift_Events_TransportChangeEvent $evt)
	{
		$transportName = get_class($evt->getSource());
		$this->_logger->add(sprintf("++ Starting %s", $transportName));
	}

	/**
	 * Invoked immediately after the Transport is started.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function transportStarted(Swift_Events_TransportChangeEvent $evt)
	{
		$transportName = get_class($evt->getSource());
		$this->_logger->add(sprintf("++ %s started", $transportName));
	}

	/**
	 * Invoked just before a Transport is stopped.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function beforeTransportStopped(Swift_Events_TransportChangeEvent $evt)
	{
		$transportName = get_class($evt->getSource());
		$this->_logger->add(sprintf("++ Stopping %s", $transportName));
	}

	/**
	 * Invoked immediately after the Transport is stopped.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function transportStopped(Swift_Events_TransportChangeEvent $evt)
	{
		$transportName = get_class($evt->getSource());
		$this->_logger->add(sprintf("++ %s stopped", $transportName));
	}

	/**
	 * Invoked as a TransportException is thrown in the Transport system.
	 *
	 * @param Swift_Events_TransportExceptionEvent $evt
	 */
	public function exceptionThrown(Swift_Events_TransportExceptionEvent $evt)
	{
		$e = $evt->getException();
		$message = $e->getMessage();
		$this->_logger->add(sprintf("!! %s", $message));
		$message .= PHP_EOL;
		$message .= 'Log data:' . PHP_EOL;
		$message .= $this->_logger->dump();
		$evt->cancelBubble();
		throw new Swift_TransportException($message);
	}
}
